Threaded (Screwed) flange is similar to the Slip-On flange, but the bore is threaded. Its chief merit is that it can be assembled withour welding, explaining its use in low pressure services at ordinary atmospheric temperatures, and in highly explosive areas where welding create a hazard.
Pipe flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification.
Pipe flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification.
| Nominal Pipe Size | Outside Diameter of Flange | Diameter of Raised Face | Thickness of Flanges Min. | Diameter of Hub | Length Through Hub | Thread Length Threaded Min. | Bore | Counter-bore Threaded Flange, Min. | Diameter of Bolt Circle | Diameter of Bolt Holes | Number of Bolts | Approxi-mate Weight kgs |
| NPS | O | R | tf | X | Y | T | B | Q | W | I | n | |
| 1/2 | 95 | 34.9 | 14.3 | 38 | 22 | 16 | 22.2 | 23.6 | 66.7 | 15.9 | 4 | 0.74 |
| 3/4 | 115 | 42.9 | 15.9 | 48 | 25 | 16 | 27.7 | 29.0 | 82.6 | 19.1 | 4 | 1.21 |
| 1 | 125 | 50.8 | 17.5 | 54 | 27 | 18 | 34.5 | 35.8 | 88.9 | 19.1 | 4 | 1.56 |
| 1 1/4 | 135 | 63.5 | 20.7 | 64 | 29 | 21 | 43.2 | 44.4 | 98.4 | 19.1 | 4 | 2.11 |
| 1 1/2 | 155 | 73.0 | 22.3 | 70 | 32 | 23 | 49.5 | 50.6 | 114.3 | 22.2 | 4 | 2.97 |
| 2 | 165 | 92.1 | 25.4 | 84 | 37 | 29 | 61.9 | 63.5 | 127.0 | 19.1 | 8 | 3.64 |
| 2 1/2 | 190 | 104.8 | 28.6 | 100 | 41 | 32 | 74.6 | 76.2 | 149.2 | 22.2 | 8 | 5.26 |
| 3 | 210 | 127.0 | 31.8 | 117 | 46 | 35 | 90.7 | 92.2 | 168.3 | 22.2 | 8 | 7.08 |
| 3 1/2 | 230 | 139.7 | 35.0 | 133 | 49 | 40 | 103.4 | 104.9 | 184.2 | 25.4 | 8 | 8.99 |
| 4 | 275 | 157.2 | 38.1 | 152 | 54 | 42 | 116.1 | 117.6 | 215.9 | 25.4 | 8 | 14.83 |
| 5 | 330 | 185.7 | 44.5 | 189 | 60 | 48 | 143.8 | 144.4 | 266.7 | 28.6 | 8 | 24.46 |
| 6 | 355 | 215.9 | 47.7 | 222 | 67 | 51 | 170.7 | 171.4 | 292.1 | 28.6 | 12 | 28.78 |
| 8 | 420 | 269.9 | 55.6 | 273 | 76 | 58 | 221.5 | 222.2 | 349.2 | 31.8 | 12 | 43.77 |
| 10 | 510 | 323.8 | 63.5 | 343 | 86 | 66 | 276.2 | 276.2 | 431.8 | 34.9 | 16 | 71.35 |
| 12 | 560 | 381.0 | 66.7 | 400 | 92 | 70 | 327.0 | 328.6 | 489.0 | 34.9 | 20 | 84.95 |
| 14 | 605 | 412.8 | 69.9 | 432 | 94 | 74 | 359.2 | 360.4 | 527.0 | 38.1 | 20 | 100.05 |
| 16 | 685 | 469.9 | 76.2 | 495 | 106 | 78 | 410.5 | 411.2 | 603.2 | 41.3 | 20 | 141.69 |
| 18 | 745 | 533.4 | 82.6 | 546 | 117 | 80 | 461.8 | 462.0 | 654.0 | 44.5 | 20 | 175.13 |
| 20 | 815 | 584.2 | 88.9 | 610 | 127 | 83 | 513.1 | 512.8 | 723.9 | 44.5 | 24 | 222.87 |
| 24 | 940 | 692.2 | 101.6 | 718 | 140 | 93 | 616.0 | 614.4 | 838.2 | 50.8 | 24 | 313.75 |
